Organisation of the genes surrounding the polyketide synthase, PKS21, of L. biglobosa ‘brassicae’. PKS21 and upstream genes show > 90% identity with genes from Arthroderma otae. Each square represents a single gene (not to scale). Genes that are present in different species are highlighted in the same colour. Ends of contigs are represented with a circle whilst arrows indicate that the contig continues. Lmb, L. maculans ‘brassicae’; Lml, L. maculans ‘lepidii’; Lbb, L. biglobosa ‘brassicae’; Lbt, L. biglobosa ‘thlaspii’; Lbc, L. biglobosa ‘canadensis’. Genes common to Lbb and A.otae have the following predicted functions: gene 2 has a retinol dehydrogenase (short chain dehydrogenase) motif; genes 3 and 5 have a methyltransferase motif, gene 4 has no conserved domains and gene 6 is a dimethyl allyl transferase.